Close-up view of orange-colored sunburst lichen (Rusavskia elegans, which replaces Xanthoria elegans) on sandstone. Montana, USA

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As these lichens grow slowly, their sizes can be used to assess the relative ages of exposed rock surfaces.

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Size: 5485px × 3657px
Location: southwestern Montana, USA
Photo credit: © Marli Miller / Alamy / Afripics
License: Licensed
Model Released: No

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